Thanks your reply.
I know "architecture-independent means this package contains only files
which are readable on any arch."
But apt disallow install.
$ apt-cache depends hime:i386
hime:i386
Depends: libc6:i386
Depends: libcairo2:i386
Depends: libgdk-pixbuf2.0-0:i386
Depends: libglib2.0-0:i386
Depends: libgtk2.0-0:i386
Depends: libpango-1.0-0:i386
Depends: libpangocairo-1.0-0:i386
Depends: libx11-6:i386
Depends: libxtst6:i386
Depends: <hime-data:i386> <-------------- unavailable
Depends: hime-tables:i386
Suggests: hime-anthy:i386
Suggests: hime-chewing:i386
Suggests: hime-qt4-immodule:i386
|Recommends: <im-config:i386> <-------------- unavailable
Recommends: <im-switch:i386> <-------------- unavailable
Recommends: hime-gtk3-immodule:i386
Conflicts: hime
The <pkg> is show "unavailable" in aptitude.